Workman-reynolds effect

From Glossary of Meteorology



Workman–Reynolds effect

A mechanism for electric charge separation during freezing of slightly impure water, discovered by Workman and Reynolds (1950).

When a very dilute solution of certain salts freezes rapidly, a strong potential difference is established between the solid and liquid phases. For some salts, the ice attains negative charge, for others, positive. This mechanism was thought to play a role in the charging of thunderstorms. It is now known that it cannot account for the electrification of riming graupel by the shedding of charged surface water because the droplets freeze faster than the time taken for a substantial ice– water freezing potential to occur. This mechanism has been suggested as one possible mode of thunderstorm charge separation in those portions of a thunderstorm downdraft where snow pellets or hail particles sweep out supercooled water drops. Partial freezing and partial blow-off of a liquid film could lead to charge separation. The acknowledged predominance of dry growth of graupel in New Mexico thunderclouds led Reynolds (1953) to question the viability of this mechanism in the atmosphere. This should not be confused with the Reynolds effect.

Workman, E. J., and S. E. Reynolds 1950. Electrical phenomena occurring during the freezing of dilute aqueous solutions and their possible relationship to thunderstorm electricity. Phys. Rev.. 78. 254–259.

Reynolds, S. E. 1953. Thunderstorm-precipitation growth and electrical-charge generation. Bull. Amer. Meteor. Soc.. 34. 117–123.


Copyright 2024 American Meteorological Society (AMS). For permission to reuse any portion of this work, please contact permissions@ametsoc.org. Any use of material in this work that is determined to be “fair use” under Section 107 of the U.S. Copyright Act (17 U.S. Code § 107) or that satisfies the conditions specified in Section 108 of the U.S.Copyright Act (17 USC § 108) does not require AMS’s permission. Republication, systematic reproduction, posting in electronic form, such as on a website or in a searchable database, or other uses of this material, except as exempted by the above statement, require written permission or a license from AMS. Additional details are provided in the AMS Copyright Policy statement.